Year | Value | 2022 | 78.337728393972 | 2021 | 77.842451819684 | 2020 | 77.375493829985 | 2019 | 75.979372200082 | 2018 | 76.082107951187 | 2017 | 75.37847125476 | 2016 | 76.120189773326 | 2015 | 75.853763609305 | 2014 | 76.204722462603 | 2013 | 76.252292809492 | 2012 | 78.184184027698 | 2011 | 77.89038845206 | 2010 | 77.528990567615 | 2009 | 77.942637166957 | 2008 | 77.523943275292 | 2007 | 75.103523273318 | 2006 | 76.626124973838 | 2005 | 76.028771856607 | 2004 | 74.430476387658 | 2003 | 74.105548712129 | 2002 | 74.216790821195 | 2001 | 73.419727764311 | 2000 | 74.992281310759 | 1999 | 76.266680797322 | 1998 | 77.850897721528 | 1997 | 75.676191384821 | 1996 | 75.273241609875 | 1995 | 74.473170123446 | 1994 | 74.387417218543 | 1993 | 74.987880579367 | 1992 | 78.150252122295 | 1991 | 78.793423460187 | 1990 | 78.665913539217 | 1989 | 76.476850105104 | 1988 | 75.627700072715 | 1987 | 75.03679401484 | 1986 | 74.389591565579 | 1985 | 76.204688180066 | 1984 | 74.658370228551 | 1983 | 75.038524966882 | 1982 | 77.243956838869 | 1981 | 76.738952536825 | 1980 | 79.14971352653 | 1979 | 77.174333204484 | 1978 | 77.529610829103 | 1977 | 76.500671226747 | 1976 | 75.307934689201 | 1975 | 80.277485072006 | 1974 | 78.219584569733 | 1973 | 74.383219215303 | 1972 | 75.673272357724 | 1971 | 76.71772428884 |
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